Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T27: Superconductivity:Devices & Materials-II
11:30 AM–2:06 PM,
Thursday, March 9, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Daniel Duong, University of South Carolina
Abstract: T27.00005 : Diode effect in Josephson junctions with epitaxial trigonal tellurium tunnel barrier*
12:18 PM–12:30 PM
Presenter:
Varrick Suezaki
(University of California Riverside)
Authors:
Varrick Suezaki
(University of California Riverside)
Daniel Morales
(University of California, Riverside)
En-De Chu
(University of California, Riverside)
Peng Wei
(University of California, Riverside)
gained many interests. Such phenomena, also known as Josephson diode effect (JDE), could be tied to the
broken inversion symmetry and/or broken time reversal symmetry of the superconductor or the barrier
material itself. In this talk, we will demonstrate the fabrication of Josephson junctions with epitaxial
barrier material, i.e. trigonal tellurium, which hosts chiral chains of Te atoms along its c-axis and breaks
inversion symmetry. Based on our prior results in trigonal tellurium tunnel barriers, where evidences of
Andreev bound states and largely enhanced Lande g-factor are observed, we will demonstrate JDE in our
trigonal Te Josephson junction devices grown on epitaxial Nb/Au(111) layers using molecular beam
epitaxy. The trigonal phase is confirmed using both reflective high energy electron diffraction and Raman
spectroscopy. We will further discuss the response of JDE under an applied planar magnetic field, which
varies the Zeeman field.
*NSF CAREER DMR-2046648
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